$F_sigma$_set
Definition
A set $A \subseteq \mathbb{R}$ is called an $F_{\sigma}$ set if it can be written as the countable union of closed_sets.
F-sigma set
Table of Contents
Connected Notes
⤢
A set $A \subseteq \mathbb{R}$ is called an $F_{\sigma}$ set if it can be written as the countable union of closed_sets.